首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The Earth has been stripped of up to 90% of its species five times before in the past 450 million years. Now it’s about to happe
The Earth has been stripped of up to 90% of its species five times before in the past 450 million years. Now it’s about to happe
admin
2015-01-31
87
问题
The Earth has been stripped of up to 90% of its species five times before in the past 450 million years. Now it’s about to happen again—and this time there’s no rogue asteroid(小行星)to blame. One of the first great rules of terrestrial biology is that no species is forever. The Earth has gone through five major extinction events before. The result of all of the extinctions was the same: death, a lot of it.
As increasingly accepted theories have argued—and as the Science papers show— we are now in the midst of the sixth great extinction, the unsettlingly-named Anthropocene(人类纪), or the age of the humans.
As the authors of all this loss, we are doing our nasty work in a lot of ways. Overexploitation—which is to say killing animals for food, clothing or the sheer perverse pleasure of it—plays a big role. So we get elephants slaughtered for their tusks, rhinos poached(偷猎)for their horns and tigers shot and skinned for their pelts, until oops— no more elephants, rhinos or tigers.
Habitat destruction is another big driver, particularly in rainforests. And you don’ t even have to chop or burn an ecosystem completely away to threaten its species; sometimes all it takes is cutting a few roads across it or building a few farms or homes in the wrong spots.
Then too there is global warming, which makes once-hospitable habitats too hot or dry or stormy for species adapted to different conditions. Finally, as TIME’s Bryan Walsh wrote in last week’ s cover story, there are invasive species—pests like the giant African snail, the lionfish—which hitch a ride into a new ecosystem on ships or packing material, or are brought in as pets, and then reproduce wildly, crowding out native species.
It oughtn’ t to take appealing to our self-interest to get us to quit making such a mess of what we ’re increasingly coming to learn is an exceedingly destructible world. But it’ s that very self-interest that led us to make that mess in the first place. We can either start to change our ways, or we can keep going the way we are—at least until the Anthropocene extinction claims one final species: our own.
The first sentence in the first paragraph doesn’ t indicate that______.
选项
A、the species on earth have decreased 90% now
B、the past 450 million years have witnessed extinction several times
C、every extinction has a 90% species decrease
D、the earth has experienced five great extinction
答案
A
解析
细节题。“The Earth has been stripped of up to 90% of its species five timesbefore in the past 450 million years”意为在过去的4.5亿年中,地球曾经五次损失了90%的生物。A中错在不是现在,而是在过去的4.5亿年。B、C、D都符合文意。本题考察的是对成分复杂句子的解读。
转载请注明原文地址:https://kaotiyun.com/show/AAq7777K
0
大学英语四级
相关试题推荐
"Avoidtherush-hour"mustbethesloganoflargecitiestheworldover,whereveryoulookit’speople,people,people.Thetrai
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Populationsofwell-lovedspeciessuchastheturtledove,nightingaleandcuckoo,whichcometobreedintheUKandtheContine
Everybodywantstogetwealthy.Intoday’s【B1】______world,makingmoneyorbecomingwealthysymbolizesaperson’ssuccessandc
ItAin’tEasyBeingGreenGreenstoriesofhotelsA)Overthesummer,IstayedatfourhotelsintheUnitedStates.Theywereal
Ofallthelessonstaughtbythefinancialcrisis,themostpersonalhasbeenthatAmericansaren’tsogoodatmoney-management.
Ofallthelessonstaughtbythefinancialcrisis,themostpersonalhasbeenthatAmericansaren’tsogoodatmoney-management.
Couldthereasonfortheworld’seconomicmisfortunesallcomedowntofingerlength?Althoughcertainlyanoversimplificationo
Geneticallymodified(GM)foodstuffsareheretostay.That’snottosaythatfoodproducedby【C1】______agriculturewilldisappea
随机试题
下列病变应当选择的检查方法A.咬颌翼片B.下颌后部咬颌片C.下颌横断咬颌片D.下颌骨后前位片E.根尖片邻面龋
脑出血患者,45岁。入院2天,一直处于浅昏迷状态,颅内压继续增高,生命体征尚可,心肾功能良好,脑CT示小脑出血血肿200ml左右,侧脑室有扩大征象,采取何种措施最合适
最惠国待遇是是世贸组织多边贸易制度中最重要的基本原则和义务,则下列关于其的说法哪项是正确的?()
[2007年第148题,2003年第137题]无障碍设计中,只设坡道的建筑入口,坡道最大坡度为:
《律师事务所从事证券法律业务管理办法》规定,律师被吊销执业证书的,限制从事部分证券法律业务。( )
当股票投资必要收益率等于无风险收益率时,β系数()。
物流信息系统测试方法可分为()。
幼儿园要重视各种体育活动,特别是户外体育活动,每天应保证儿童至少有________小时的户外体育活动时间。
随着年龄的增长,儿童的意义记忆能力逐渐发展,机械记忆能力逐渐减弱。()
如今,传统的社会就业观的坚冰在一层层融化,科学的事业发展观的阳光在一点点升温,学子们终于豁然开朗,体面和尊严不是外在的虚荣和涂抹的光鲜,而在于自己辛勤劳动的成就,事业腾挪的空间。如果乡村同样能够圆梦,有实现人生价值的机会,有事业发展的天地,为什么还要株守于
最新回复
(
0
)